With some PRs the preview pane is not rendering fine anymore - how to track it down what breaks the UI?

[jgrumboe]

Hi,

With some PRs my preview pane is breaking the whole UI. Text bleeds into next line, menu and main list is completely messed up.
I somehow think it's related to PRs created by renovatebot.

Here is a screenshot with preview disabled, everything still working:

And here I just press "p" to open the preview for the first PR - UI is broken:

How can I hunt down what the problem could be to create a proper issue?

[dlvhdr]

Hmm what happens if you limit the preview sidebar size to a smaller or larger number?

[jgrumboe]

It get's more or less worse but doesn't go away. So, it seems to be related with the content length probably.